A115665 - OEIS

%I #2 Mar 30 2012 17:40:35

%S 4,6,9,15,49,121,143,169,187,221,289,319,323,341,437,493,533,551,559,

%T 589,629,667,737,767,781,817,851,871,893,899,913,923,949,961,979,989,

%U 1027,1067,1079,1121,1219,1247,1273,1343,1357,1387,1411,1513,1577

%N Brilliant numbers (A078972) whose digit reversal is a semiprime (A001358).

%e 551=19*29 is brilliant and 155=5*31 is semiprime.

%Y Cf. A001358, A078972, A115666.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Jan 31 2006